Use & maintenance

1. Main applications                             

Kebony® is the best choice of material for external applications where durability, environmental credentials and low maintenance are important.

Kebony is produced from sustainably-sourced timber and impregnated with a bio-based, non-toxic liquid. The chemicals are polymerised to inside the wood fibres, creating a stable, hard and durable wood material.

2. Product safety

Kebony is environmentally friendly and non-toxic, both in use and when disposed of as waste.

3. Machining / further processing

Kebony wood can be processed with normal hardwood tools and machinery.

Kebony character is not intended for further machining of its surface. Kebony clear may be sanded, brushed, planed and profiled without reducing durability.

4. Dimensional stability

Kebony is a natural product which means there will be some swelling and shrinkage due to changes in humidity. However, the Kebony process dramatically increases the dimensional stability of the wood. Maximum swelling across the boards from completely dry to complete water saturation is:

  • 6% of the board width for Kebony character
  • 4% for Kebony clear.
  • Swelling of untreated wood in the same conditions will be about 8% of board width.

5. Appearance and surface treatment (after installation)

Kebony boards have a deep brown colour that will form a silver-grey patina over time. The speed of this process depends on exposure conditions and type of application, normally it will happen gradually over a few months but intense exposure to sunlight and rain will accelerate the process. The change in appearance has no effect on resistance to decay or other technical product properties.

Surface treatment with oil, stain or paint will reduce the greying effect or change the colour of the installation:

  • All Kebony products may be surface coated in cases where retaining the original colour as long as possible, or changing the colour and appearance using paint, is desired.
  • When surface coating is applied, the directions from the coating manufacturer should be followed closely.

6. Kebony boards combined with metals

Water runoff from Kebony onto zinc parts may result in the discolouration of the zinc surfaces, e.g. on roof gutters, zinc window sills or other zinc details. In cases where zinc products are installed together with Kebony, refer to documentation from the zinc product supplier.

Water runoff from Kebony onto copper parts may result in colour variations on the copper surfaces; since the Kebony will keep copper shiny while copper normally goes through surface oxidation to a dark green or black surface colour.

Kebony can be combined with aluminium parts without any discolouration effects.

Kebony does not accept responsibility for products not manufactured by Kebony.

7. Maintenance of uncoated Kebony

Safety in use of cleaning agents

Instructions printed on the labels of cleaning agents should be followed closely with respect to use, safety precautions and waste disposal. Please refer to the manufacturers’ handling and application guidelines when using cleaning agents.

Use of high-pressure washers

Kebony does not recommend the use of high-pressure washing on its products. However, Kebony boards may be washed with high-pressure washers equipped with suitable brushes. The water jet of high-pressure washers should never be applied directly to the wood surface.

Surface cleaning

Removing deposits of dirt, sand and other particles is simply done with a brush and water.

Surface contamination of mould or algae can be removed by brushing and washing with water containing ordinary household cleaning agents or detergents suitable for external household cleaning. 

Manufacturers’ guidelines for cleaning products should be observed. Kebony recommends rinsing with clean water after all surface deposits have been removed.

Heavily contaminated surfaces may be cleaned with alkaline detergents or detergents containing oxalic acid or hypochlorite. Manufacturers’ instructions should be observed. Such strong cleaning agents may lighten the surface colour of the Kebony cladding to a slightly brighter appearance than the original appearance at installation.

Stains and discolouration caused by incompatible metal parts

Rust or black stains as a result of using non-stainless fasteners or other incompatible metal parts can be removed with cleaning solutions containing oxalic acid.

8. Storage

Kebony boards should be stored under cover before installation in order to avoid weathering effects resulting in colour variations prior to installation.

9. Waste disposal

Waste from Kebony boards can be disposed of in the same manner as untreated wood. Kebony can be burned like untreated wood, and will not release any smoke components other than those released when burning untreated wood.

10. References

Other Kebony documents may be downloaded from www.kebony.com and the respective local pages:

  • Product data sheets
  • Material data sheet
  • Installation guidelines
  • Material Safety Data Sheets